Fluid blast interrupting device for oil circuit breakers employing auxiliary contact

Claim 1

A CIRCUIT INTERRUPTER COMPRISING AN ENCLOSING STRUCTURE, A PAIR OF RELATIVELY STATIONARY AND MOVABLE COOPERATING CONTACTS ADAPTED TO SEPARATE IN SAID STRUCTURE TO DRAW AN ARC, AN ARC EXTINGUISHING FLUID IN SAID STRUCTURE, MEANS FOR SEPARATING SAID STATIONARY AND MOVABLE CONTACTS TO DRAW AN ARC TO BE EXTINGUISHED BY BLAST ACTION WITHIN SAID STRUCTURE, A SPRING BIASED PISTON, A CONDUCTIVE PORTION ON SAID PISTON FORMING AN AUXILIARY CONTACT, SAID MOVABLE AND STATIONARY CONTACTS ENGAGING EACH OTHER IN CONTACT CLOSED POSITION, AND MEANS OPERATIVE DURING CIRCUIT CLOSING MOVEMENT OF SAID INTERRUPTER FOR ENGAGING SAID MOVABLE CONTACT AND DRIVING SAID PISTON TO ITS BIASED POSITION WITHIN SAID STRUCTURE SO THAT DURING A CIRCUIT OPENING OPERATION SAID PISTON MOVES IN CONTACT OPENING DIRECTION FOR APPLYING AN IMPULSE BLAST TO THE ARC IMMEDIATELY AFTER SEPARATION OF SAID STATIONARY AND MOVABLE CONTACTS, SAID AUXILIARY CONTACT MOVING INTO ENGAGEMENT WITH SAID STATIONARY CONTACT UPON SEPARATION OF SAID STATIONARY AND MOVABLE CONTACTS, SAID MOVABLE CONTACT SEPARATING FROM SAID AUXILIARY CONTACT AT A DISTANCE FROM SAID STATIONARY CONTACT.